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controller.go
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controller.go
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// Copyright 2016 The etcd-operator Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package controller
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"sync"
"time"
"github.com/coreos/etcd-operator/pkg/analytics"
"github.com/coreos/etcd-operator/pkg/backup/s3/s3config"
"github.com/coreos/etcd-operator/pkg/cluster"
"github.com/coreos/etcd-operator/pkg/spec"
"github.com/coreos/etcd-operator/pkg/util/constants"
"github.com/coreos/etcd-operator/pkg/util/k8sutil"
"github.com/coreos/etcd-operator/pkg/util/probe"
"github.com/Sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kwatch "k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
v1beta1extensions "k8s.io/client-go/pkg/apis/extensions/v1beta1"
)
var (
supportedPVProvisioners = map[string]struct{}{
constants.PVProvisionerGCEPD: {},
constants.PVProvisionerAWSEBS: {},
constants.PVProvisionerNone: {},
}
ErrVersionOutdated = errors.New("requested version is outdated in apiserver")
initRetryWaitTime = 30 * time.Second
// Workaround for watching TPR resource.
// client-go has encoding issue and we want something more predictable.
KubeHttpCli *http.Client
MasterHost string
)
type Event struct {
Type kwatch.EventType
Object *spec.Cluster
}
type Controller struct {
logger *logrus.Entry
Config
// TODO: combine the three cluster map.
clusters map[string]*cluster.Cluster
// Kubernetes resource version of the clusters
clusterRVs map[string]string
stopChMap map[string]chan struct{}
waitCluster sync.WaitGroup
}
type Config struct {
Namespace string
ServiceAccount string
PVProvisioner string
s3config.S3Context
KubeCli kubernetes.Interface
}
func (c *Config) Validate() error {
if _, ok := supportedPVProvisioners[c.PVProvisioner]; !ok {
return fmt.Errorf(
"persistent volume provisioner %s is not supported: options = %v",
c.PVProvisioner, supportedPVProvisioners,
)
}
allEmpty := len(c.S3Context.AWSConfig) == 0 && len(c.S3Context.AWSSecret) == 0 && len(c.S3Context.S3Bucket) == 0
allSet := len(c.S3Context.AWSConfig) != 0 && len(c.S3Context.AWSSecret) != 0 && len(c.S3Context.S3Bucket) != 0
if !(allEmpty || allSet) {
return errors.New("AWS/S3 related configs should be all set or all empty")
}
return nil
}
func New(cfg Config) *Controller {
return &Controller{
logger: logrus.WithField("pkg", "controller"),
Config: cfg,
clusters: make(map[string]*cluster.Cluster),
clusterRVs: make(map[string]string),
stopChMap: map[string]chan struct{}{},
}
}
func (c *Controller) Run() error {
var (
watchVersion string
err error
)
if len(c.Config.AWSConfig) != 0 {
// AWS config/creds should be initialized only once here.
// It will be shared and used by potential cluster's S3 backup manager to manage storage on operator side.
err := setupS3Env(c.Config.KubeCli, c.Config.S3Context, c.Config.Namespace)
if err != nil {
return err
}
}
for {
watchVersion, err = c.initResource()
if err == nil {
break
}
c.logger.Errorf("initialization failed: %v", err)
c.logger.Infof("retry in %v...", initRetryWaitTime)
time.Sleep(initRetryWaitTime)
// todo: add max retry?
}
c.logger.Infof("starts running from watch version: %s", watchVersion)
defer func() {
for _, stopC := range c.stopChMap {
close(stopC)
}
c.waitCluster.Wait()
}()
probe.SetReady()
eventCh, errCh := c.watch(watchVersion)
go func() {
pt := newPanicTimer(time.Minute, "unexpected long blocking (> 1 Minute) when handling cluster event")
for ev := range eventCh {
pt.start()
if err := c.handleClusterEvent(ev); err != nil {
c.logger.Warningf("fail to handle event: %v", err)
}
pt.stop()
}
}()
return <-errCh
}
func (c *Controller) handleClusterEvent(event *Event) error {
clus := event.Object
if clus.Status.IsFailed() {
clustersFailed.Inc()
if event.Type == kwatch.Deleted {
delete(c.clusters, clus.Metadata.Name)
delete(c.clusterRVs, clus.Metadata.Name)
return nil
}
return fmt.Errorf("ignore failed cluster (%s). Please delete its TPR", clus.Metadata.Name)
}
// TODO: add validation to spec update.
clus.Spec.Cleanup()
switch event.Type {
case kwatch.Added:
stopC := make(chan struct{})
nc := cluster.New(c.makeClusterConfig(), clus, stopC, &c.waitCluster)
c.stopChMap[clus.Metadata.Name] = stopC
c.clusters[clus.Metadata.Name] = nc
c.clusterRVs[clus.Metadata.Name] = clus.Metadata.ResourceVersion
analytics.ClusterCreated()
clustersCreated.Inc()
clustersTotal.Inc()
case kwatch.Modified:
if _, ok := c.clusters[clus.Metadata.Name]; !ok {
return fmt.Errorf("unsafe state. cluster was never created but we received event (%s)", event.Type)
}
c.clusters[clus.Metadata.Name].Update(clus)
c.clusterRVs[clus.Metadata.Name] = clus.Metadata.ResourceVersion
clustersModified.Inc()
case kwatch.Deleted:
if _, ok := c.clusters[clus.Metadata.Name]; !ok {
return fmt.Errorf("unsafe state. cluster was never created but we received event (%s)", event.Type)
}
c.clusters[clus.Metadata.Name].Delete()
delete(c.clusters, clus.Metadata.Name)
delete(c.clusterRVs, clus.Metadata.Name)
analytics.ClusterDeleted()
clustersDeleted.Inc()
clustersTotal.Dec()
}
return nil
}
func (c *Controller) findAllClusters() (string, error) {
c.logger.Info("finding existing clusters...")
clusterList, err := k8sutil.GetClusterList(c.Config.KubeCli.CoreV1().RESTClient(), c.Config.Namespace)
if err != nil {
return "", err
}
for i := range clusterList.Items {
clus := clusterList.Items[i]
if clus.Status.IsFailed() {
c.logger.Infof("ignore failed cluster (%s). Please delete its TPR", clus.Metadata.Name)
continue
}
clus.Spec.Cleanup()
stopC := make(chan struct{})
nc := cluster.New(c.makeClusterConfig(), &clus, stopC, &c.waitCluster)
c.stopChMap[clus.Metadata.Name] = stopC
c.clusters[clus.Metadata.Name] = nc
c.clusterRVs[clus.Metadata.Name] = clus.Metadata.ResourceVersion
}
return clusterList.Metadata.ResourceVersion, nil
}
func (c *Controller) makeClusterConfig() cluster.Config {
return cluster.Config{
PVProvisioner: c.PVProvisioner,
ServiceAccount: c.Config.ServiceAccount,
S3Context: c.S3Context,
KubeCli: c.KubeCli,
}
}
func (c *Controller) initResource() (string, error) {
watchVersion := "0"
err := c.createTPR()
if err != nil {
if k8sutil.IsKubernetesResourceAlreadyExistError(err) {
// TPR has been initialized before. We need to recover existing cluster.
watchVersion, err = c.findAllClusters()
if err != nil {
return "", err
}
} else {
return "", fmt.Errorf("fail to create TPR: %v", err)
}
}
if c.Config.PVProvisioner != constants.PVProvisionerNone {
err = k8sutil.CreateStorageClass(c.KubeCli, c.PVProvisioner)
if err != nil {
if !k8sutil.IsKubernetesResourceAlreadyExistError(err) {
return "", fmt.Errorf("fail to create storage class: %v", err)
}
}
}
return watchVersion, nil
}
func (c *Controller) createTPR() error {
tpr := &v1beta1extensions.ThirdPartyResource{
ObjectMeta: metav1.ObjectMeta{
Name: spec.TPRName(),
},
Versions: []v1beta1extensions.APIVersion{
{Name: spec.TPRVersion},
},
Description: spec.TPRDescription,
}
_, err := c.KubeCli.ExtensionsV1beta1().ThirdPartyResources().Create(tpr)
if err != nil {
return err
}
return k8sutil.WaitEtcdTPRReady(c.KubeCli.CoreV1().RESTClient(), 3*time.Second, 30*time.Second, c.Namespace)
}
// watch creates a go routine, and watches the cluster.etcd kind resources from
// the given watch version. It emits events on the resources through the returned
// event chan. Errors will be reported through the returned error chan. The go routine
// exits on any error.
func (c *Controller) watch(watchVersion string) (<-chan *Event, <-chan error) {
eventCh := make(chan *Event)
// On unexpected error case, controller should exit
errCh := make(chan error, 1)
go func() {
defer close(eventCh)
for {
resp, err := k8sutil.WatchClusters(MasterHost, c.Config.Namespace, KubeHttpCli, watchVersion)
if err != nil {
errCh <- err
return
}
if resp.StatusCode != http.StatusOK {
resp.Body.Close()
errCh <- errors.New("invalid status code: " + resp.Status)
return
}
c.logger.Infof("start watching at %v", watchVersion)
decoder := json.NewDecoder(resp.Body)
for {
ev, st, err := pollEvent(decoder)
if err != nil {
if err == io.EOF { // apiserver will close stream periodically
c.logger.Debug("apiserver closed stream")
break
}
c.logger.Errorf("received invalid event from API server: %v", err)
errCh <- err
return
}
if st != nil {
resp.Body.Close()
if st.Code == http.StatusGone {
// event history is outdated.
// if nothing has changed, we can go back to watch again.
clusterList, err := k8sutil.GetClusterList(c.Config.KubeCli.CoreV1().RESTClient(), c.Config.Namespace)
if err == nil && !c.isClustersCacheStale(clusterList.Items) {
watchVersion = clusterList.Metadata.ResourceVersion
break
}
// if anything has changed (or error on relist), we have to rebuild the state.
// go to recovery path
errCh <- ErrVersionOutdated
return
}
c.logger.Fatalf("unexpected status response from API server: %v", st.Message)
}
c.logger.Debugf("etcd cluster event: %v %v", ev.Type, ev.Object.Spec)
watchVersion = ev.Object.Metadata.ResourceVersion
eventCh <- ev
}
resp.Body.Close()
}
}()
return eventCh, errCh
}
func (c *Controller) isClustersCacheStale(currentClusters []spec.Cluster) bool {
if len(c.clusterRVs) != len(currentClusters) {
return true
}
for _, cc := range currentClusters {
rv, ok := c.clusterRVs[cc.Metadata.Name]
if !ok || rv != cc.Metadata.ResourceVersion {
return true
}
}
return false
}